private static void CopyEncrypt(string source, string destination)
{
var data = File.ReadAllBytes(source);
var hash = CalculateHash(ref data);
if (File.Exists(destination))
{
var dest = new byte[80];
using (var fs = new FileStream(destination, FileMode.Open, FileAccess.Read))
fs.Read(dest, 0, dest.Length);
var head = new CryptedFileHeader(ref dest);
if (head.Hash == Convert.ToBase64String(hash))
{
return;
}
}
using (var fs = new FileStream(destination, FileMode.Create, FileAccess.Write))
{
var salt = Guid.NewGuid();
var buffer = salt.ToByteArray();
fs.Write(buffer, 0, buffer.Length);
fs.Write(hash, 0, hash.Length);
using (var crypter = GenerateRijndael($"{salt:N}{Password}").CreateEncryptor())
buffer = crypter.TransformFinalBlock(data, 0, data.Length);
fs.Write(buffer, 0, buffer.Length);
}
}
private static void CopyDecrypt(string source, string destination)
{
var data = File.ReadAllBytes(source);
var head = new CryptedFileHeader(ref data);
if (File.Exists(destination))
{
var dest = File.ReadAllBytes(destination);
if (head.Hash == Convert.ToBase64String(CalculateHash(ref dest)))
{
return;
}
}
using (var crypter = GenerateRijndael($"{head.Salt}{Password}").CreateDecryptor())
File.WriteAllBytes(destination, crypter.TransformFinalBlock(data, 80, data.Length - 80));
}
